26 Aug
2004
26 Aug
'04
10:52 p.m.
On Thu, 2004-08-26 at 10:19, Alastair Couper wrote:
I have two hard drives, hda and hdb, both UDMA66. hda
has the ext3 root
partition, a swap partition, and a FAT32 partition. hdb just has one
10Meg FAT32 partition.
When I stream a .wav file from the FAT32 partition on hda through say
XMMS, the total system load is very low, just a few percent cpu load.
When I do the same, but from hdb's FAT32 partition, the cpu load hovers
at around 30-50%. What is responsible for all the extra cpu activity in
reading from the 2nd harddrive ?
I would suspect that DMA is not enabled forthe slave drive, it's doing
PIO and you're running every byte from the drive through the processor
on its way to memory. Turn DMA on and none of the bytes go through the
processor. Just a guess...
- Mark